Fly-wheel construction for gas-engines.



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A. J. MoGOLLUM. FLY WHEEL CONSTRUCTION FOR GAS ENGINES.

APPLICATION PiLBD DEC. 21, may

WITNESSES: l INVENTOR I UNITED STATES PA'lENT OFFICE. Y

AltOlIIBALDJ. M'COOLLUM, Ol ClllUAGO, ILLINOIS, nSSl GNOlt TO ARMAC MOTOR COMlD'iNY,

. Oi OlilOAtlO, lLlilNOlb, A (JOltlOltA'llON Ol" ILLINOIS.

FLY-WHEEL CONSTRUCTION FOR GAS-ENGINES.

Specification of Letters Patent.

Patented Sept. 24, 1907.

Applicationfiled December 21,1906- Ssrial No. 348,865-

To all whom i! may concern:

Be it known that vI, AROlllllALl) J. McOoLLUina citizen of the United States, residing in Chicago, county of Cook, and State oi Illinois, have invented certain new and useful Improvements in Fly-Wheel Constructions ior Gas-Engines, of which the following is a specilieati My invention relates to that class of gas engines in which the fly wheel is a part of the crank, and is do 1-0 signed to provide a construction which will permit of a material addition to the bearing surface of the journal bearings with a minimum of width, and is more particularly adapted for use upon motor cycles.

In gas engines used upon motor cycles it is very dim- .cult to get a narrow engine suitablefor this class 01' work I without greatly decreasing the bearing surface, with the result that the engine runs hot in a comparatively short time. I My invention has ior its object to avoid this objection and my meansoi accomplishing this result may be more readily understood-by having reference to the accompanying drawings, which are hereunto annexed and are a part of this specification, in which,- the figure is an elevation of my improved fly wheel; one of the walls being shown in section to disclose the interior construction. Similar reference numerals refer to similar, parts throughout the entire description. Q In the drawings, 1 indicates the internal fiy whriel. This is constructed as better shown in the sectional view with an annular disk 2 havingan annular rib 3 at its periphery. A hub or boss 4 is located at a suitable .distance irom the center of the disk 2. This boss has a taper socket 5 counter bored in i fitted the wrist pin 6 of the connecting rod 7. By making this hole tapered, it is obvious, i'rom an examination of the drawings, that not only the bearing surface oi the pin 6 is greatly increased but the shear is resisted by the-largest possible mass of metal,; the in 6 being providcd'with a bushing 14 of bronze or other suitable metal and held in position by a nut 15} A hub 8 is lo-- cated at the center of the disk 2 and exlcnds outwardly for a distance corresponding to the width of the annular .rib 3. This hub has an opening eiitending through its center in which is fitted the reduced end Slot the rod 10.

-The inner face of the disk 2 is countersunk, as shown at 11, and the reduced end 9 of the rod 10 is headed up over. this countersink securing the rod 10 firmly and rigidly to the disk 2. The surface of the rod 10 and the hub 8 is then ground to size and a hardened steel sleeve 12 is fitted over the rod l0 and the exterior surface of the hub 8. This hardenedsleeve, as can be seen from the its interior, to which is' I holug a'tuper socket in said drawings, extends to the outer iace of the disk 2, the wall of which may be approximately one-fourth or tlu'ee-sixtecnths of an inch in thickness, and said sleeve provides for a smooth, oven suri'acc oi increased diameter furnishing an extended bearing surface which cannot be obtained except by this method.

The rod 10 extends beyond the endof the sleeve 12 forming a suitable mounting for a sprocket wheel or pul- 6t) ley, as'is desired, threads 13 cut upon the end of the rod 10 provide for a lock-nut to hold the driving member in position, although it is obvious that any other form ol fastening may be utilized for this purpose without departing from the spirit of my invention.

following this form of construction it becomes possible to greatly reduce the width of the crank and at the same time preserve a sufficiently long bearing to run cool and that without sacrificing the required strength. It is possible that changes may suggest themselves to 70. mechanics in constructing this crank and I do not wish to be limited to the precise form of construction shown, as there are obviously many minor changes whieh'co old he made without departing from the spirit oi my invention. v V

Having described my invention, what I regard as new, and-desire to secure by Letters Patent, is: v

- 1. A fly wheel, sald wheel being constructed of two disks each of which hns an annular rib at its periphery, an outwardly extending boss located on each of said disks, there 30 being-a taper socket in said bosses, an outwardly extending hub at the center of each of said dlsks, a rod mounted in each of said hubs whose external diameters are coincident with the external diameters of the hubs, each rod having means for securing and holding it in position, and a steel sleeve fitted over each rod and the exterior surfuce'of the adjacent hub, for the purpose set forth substantially as described.

2. A fly wheel, said wheel being constructed of two disks each of which has an annular rib at its periphery, an out- 0' wardly extending boss located 'on each of said disks, there bosses, an outwardly extending huh at the center of each of said disks, :1 rod mounted in each of said hubs, whose external diameters are edinci dent with the external diameters of the hubs, each rod having means for securing and holding it in position, and a steel sleeve titted over each rod and the exterior surface of the adjacent huh, there being threads cut upon the-ends of said rods, for the purpose set forth substantlullyus de scribed.

' 3. A ily wheel, said wheel being constructed of two disks eaclroii which has an annular rib at its periphery, an outwardly cxteudhn, boss located on each of said disks, there being 0. tuner socket in said bosses, an outwardly extendtrig hub at the center of each of said disks, :1 rod mounted in each of said hubs whose external diameters are colnctdent with the external diameters of the hubs, each rod having means for securing and holding it in position, a steel slecveflttcd over each rod and the exterior surface of socket, fol: the

scribed.

the adjaceni hub, there bein said rods, and a 5; threads cut upon'the ends of g L bnnecting r051 mounted in said ll!!!)fll purpose set forth,'subatantiully as de- J L Ai fly wheel, said wheel being constructed of two disks eachof which has an annular rib at'i ts periphery, an outwax-61y" exteniling boss IOCMEQ on each of said disks, there b'ging a taiier socket in said bosses, an outwardly extend in'g-ixub at the genter cf and of said diskfi, :1 rod mounted in one]; oi said hubs whose external dinmz: dent with the external diameters of the i and of each rod being riwtod to the disk, for the purpose se scribed.

(01's are ('ninui llliiS, Lhu im r securing tin. rm] 1 My t fm'lh, substantially nrs iv- ARCHIBALI.) J. MMIULIAIM \Vilnessus II. I. S-rmmn'r, B. F. ilmis'rmn. 

